Travel CDC warns ‘avoid cruise travel’ after more than 5,000 COVID cases in two weeks amid omicron December 30, 2021December 30, 2021 Morgan Hines, USA TODAY Comments Off on CDC warns ‘avoid cruise travel’ after more than 5,000 COVID cases in two weeks amid omicron Between Nov. 30 and Dec. 14, cruise ships reported 162 cases of COVID-19 to the CDC. Between Dec. 15 and Dec. 29, 5,013 COVID-19 cases to the CDC.